Excellent luminous efficiency and high thermal stability of glass-in-LuAG ceramic for laser-diode-pumped green-emitting phosphor

A kind of glass-in-LuAG (GIP) ceramic with excellent luminous efficiency and high thermal stability was fabricated by solid-state sintering for laser diode (LD)-pumped green-emitting phosphor. The GIP ceramic employing particularly designed borosilicate glass as adhesive exhibits high thermal conductivity (2.8 W/m . K at 80 degrees C) and remarkable improvement in thermal stability (T-g = 711 degrees C) and reliability (luminous flux has only a 0.5% drop after 100 h at 300 degrees C). When the GIP ceramic is pumped by 455 nm blue LDs (14.5 W/mm(2)), a luminous efficacy of 205 lm/W was achieved. More importantly, the GIP ceramic did not have luminescence saturation even under a higher power density (17.1 W/mm(2)) excitation. The novel GIP ceramic, possessing good optical and thermal properties, is promising for LD-pumped green-emitting phosphor. (C) 2018 Optical Society of America